[core] Remove duplicate export (#39346)

packages/mui-material/src/index.js

@@ -5,6 +5,7 @@ import * as colors from './colors';
 export { colors };
 export * from './styles';
 
+// TODO remove, import directly from Base UI or create one folder per module
 export * from './utils';
 
 export { default as Accordion } from './Accordion';
@@ -409,8 +410,6 @@ export { default as useAutocomplete } from './useAutocomplete';
 export { default as GlobalStyles } from './GlobalStyles';
 export * from './GlobalStyles';
 
-export { StyledEngineProvider } from './styles';
-
 export { unstable_composeClasses } from '@mui/base/composeClasses';
 
 export { default as generateUtilityClass } from './generateUtilityClass';